3 TECHNICAL ASSISTANCE Solenoid Does Not CloseSolenoid Closes But No TravelVehicle Travels in reverse when in forward direction, and in forward when in reverse direction.

4 PRIOR TO CONTINUED TROUBLESHOOTING THE FOLLOWING STEPS MUST BE TAKEN1. POSITION THE CART ON LEVEL GROUND AND BLOCK FRONT TIRES TO PREVENT VEHICLE FROM ROLLING.2. ELEVATE THE DRIVE TIRES FROM THE GROUND.My vehicle is safely lifted from the ground.

6 Using a digital voltmeter with the Black Lead on battery negative, battery positive should be measured on the following pins of the FX503 controllers 23-pin wiring harness.If battery positive is not measured click the arrow of the corresponding wire.PIN 2PIN 1PIN 4 and 6PIN 3All of these wires measure battery positive.

11 The solenoid is closed by the following stepsVehicle HarnessNextNext

12 First battery positive is supplied to the solenoid coil through the Run/Tow Switch, For/Rev Switch, and Key Switch.Vehicle HarnessNext

13 At this point battery positive should be measured on the Yellow/White wire.Next

14 The solenoid is closed by Pin 17, being pulled to ground.Vehicle HarnessNext

15 Pin 17 is NOT being pulled low Pin 17 is being pulled lowVerify that the Blue wire, Pin 17 is pulled low to activate the solenoid.Vehicle HarnessPin 17 is NOT being pulled lowPin 17 is being pulled low

17 At this point it is determined that your controller is faultyAt this point it is determined that your controller is faulty. Contact Flight Systems Industrial Products at to order a replacement controller.End

19 Pin 2 measures between 11.5-13V. Measure the voltage of the Black Wire, Pin 2 on your vehicle harness. This point should measure between V.Vehicle HarnessPin 2 measures between V.Pin 2 does not measure between V.

20 Pin 1 does vary between .4V – 1.6V when moving the accelerator pedal. Measure the voltage of the White Wire, Pin 1 on your vehicle harness. This point should vary from .4V - 1.6V with the accelerator pedal.Vehicle HarnessPin 1 does vary between .4V – 1.6V when moving the accelerator pedal.Pin 1 does not vary between .4V - 1.6V when moving the accelerator pedal.